Forced-hot-air heater



H. HARLOW.

FORCED HOT AIR HEATER. APPLICATION FILED APR 29. 1921.

1,40%41 1; Patented Feb. 21, 1922.

2 SHEETS-SHEET I.

H. HARLOW.

FORCED HOT AIR HEATER. APPLICATION FILED APR: 29, 1921.

1,407,411,, v Patented Feb. 21, 1922.

2 SHEETS-SHEET 2.

HARRY rrso stares.

MORGAN YEWELL, 0F LOUISVILLE, KENTUCKY.

FORCED-HOT-AIR HEATER.

Specification of Letters Patent.

Patented Feb. at, 1922?.

I Application filed April 29, 1921. Serial No. 465,562.

To all whom it may concern:

. Be it known that I, HARRYHARLQW, a citizen of the United States of America, residing at Louisville hi the county of J efferson and State-of Kentucky, have invented certain new and useful Improvements in F orced-Hot-Air Heaters, of which the following is a specification.

My present invention relates generally to the heating of buildings including residences, apartments, business houses, school buildings and the like and my object is to provide for a regular and healthful heat at minimum cost and labor, under regulation by a thermostat. These objects I preferably attain by the mechanism to be now described and which is shown in the accompanying drawings, forming a part of this application and wherein,i

Figure 1 is a top plan view of my improved heating apparatus,

Figure 2 is a vertical longitudinal section taken on line'2-2 of Figure 1, and

Figure 3 is a diagram showing the therproposed form of control coninstance a gas burner, supplied with gas through a supply pipe 6.

The casing 4 may be supported upon legs 7, secured to its base by bolts 8, and the supply pipe 6 of the burner 5-ispreferably provided with a control ,valve 9 whose slotted" control arm 9 as shown particularly in Figure 3 is swin able between two positions under control 0 a thermostat in operation, one position being a full open position and the other osition beinso near to a'cut off as to leave ut a reduce flame at the burner. The neck 3 extending to the heat distributing drum 1 forms the upper outlet end of a helical coil 10 within the casing 4, upwardly through which heat from the burner 5 may pass to an outlet. pipe 21 extending from the upper portion of the casing'for the outflow of the products of combustion of the burner. At the lower end of the coil 10 an. air supply ipe 10 communicates, this pipe leading rom a fan casing 10 within which a fan 14 operates to suck air through the open outer side of the casing and force such air throughpipe 10" and upwardly through the heating coil 10. 1

Fan 14 is mounted upon the shaft 13 of a motor 11, the latter mounted upon a base 12 and having its operation controlled through a rheostat 23 as shown in Figure 3 which with the swinging slotted arm' 24 is in circuit of the motor 11 through Wires 25 and 26 and through a suitable source of current 27, in order that the action of the motor and consequently the action of the fan 14 may be automatically controlled from a thermostat.

I have shown the thermostat at 28 in Figure 3, controlling one contact 29 movable into and out of engagement with a stationary contact 30, the latter connected to one side of the source of current to a wire 31, and the former connected by a wire 32 to the opposite side of the source of current, through electro magnets 33 and 34. These electro magnets upon energization, attract armatures 35 and 36 respectively in connection with controlling slides 37 and 38, having springs 39 and 40 which normally operate, to hold the slides in attracted position with the armatures 35 and 36 spaced from the electro magnets.

The control slides 37 and 38 have pins 41 and '42 extending into the slots of the arms 9? and 24 which respectively control the gas supply valve 9 and the motor 11 so that when the armatures 35 and 36 are attracted by and toward the electro magnets 33 and 34 the valve arm 9 will be shifted to the partially closed position and arm 24 will be shifted on the rheostat 23.to'the position effecting slow speed of the motor 11. This action takes place each time the contacts 29 and 30 come together by virtue of movement of the former with the thermostat 28 and results of course in decreased supply of heated air to the distributing drum 1 in view of the decreased speed of the fan 14 as well as-the decreased heat supply of the burner 5 I It is to be understood that the controlling features shown in Figure 3 are illustrated and described simply as an example of the manner in which the thermostat may function, and that I reserve the privilege of-substituting other control means of any suitable nature adapted and'inte'nded to bring about similar results.

' It is also understood that by virtue of the coil and its direct connection to the heating drum 1 from which heated air is forced through distributing pipes.1 5, 16, 17, l8, l9 and to various rooms or arts of a building, the air under the force draft of fan 14: can eifectively move along its prescribed path of travel without back pressure. Itis due to this fact that a motor of small capacity is sufiicient for all ordinary purposes and the apparatus provided by my invention is capable of economical use in so far as its consumption of current is concerned. It is also due in part at least to the use of a helical coil within the casing 4, upwardly through which heat products from the burner 5 may pass that air in its passage through the heater may be effectively heated for all ordinary purposes with but modest consumption of gas and under perfect control of the thermostat so that a uniform heat ing which the upper end of the is connected, heat, distributing pipes leading from the lipper larger end of said drum, a burner in the lower portion of the casing having a valved supply pipe, a fan casing connected to the lower end of the heating coil, a fan therein, a motor actuating the fan, and a thermostat controlling the supply of heated air, as described.

2..A forced hot air heater comprising a vertical cylindrical casing, a helical airheating coil rising in said casing, a distributing drumabove the casing having distributing pipes and a funnel-shaped base connected to the upper end of the coil, a burner in the lower portion of ,thecasing having valve controlled fuel feed means, a motor actuated fan for forcing air into the-lower end of the coil having a circuit including a source of current and a switch, and a heat controlling thermostat in circuit with the fan and employing the said source of current thereof, said thermostat having connections simultaneously controlling the valve of the fuel feed means and the switch of the motor,

all as described.

In testimony whereof I have aflixed my signature.

HARRY HARLOW. 

